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Alexander Haydel, 22, is charged with two counts of first degree murder, and according to a police affidavit, used Army infantry tactics in a plan to kill more police officers, the Commercial Appeal reported.

The military tactics included going up a flight of stairs to gain "higher ground" and blowing up two fire extinguishers near the downed officer -- an attempt to take advantage of officers' concern for their fallen comrade, according to police.

Haydel took a firearm and two fully loaded magazines from Warren after shooting him, which he allegedly told investigators was part of the plan to shoot more officers, according to investigators.